CN108196218A - Detection circuit, method and the electric energy meter of circuit transfer function variation - Google Patents
Detection circuit, method and the electric energy meter of circuit transfer function variation Download PDFInfo
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- CN108196218A CN108196218A CN201810058033.XA CN201810058033A CN108196218A CN 108196218 A CN108196218 A CN 108196218A CN 201810058033 A CN201810058033 A CN 201810058033A CN 108196218 A CN108196218 A CN 108196218A
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- 238000001514 detection method Methods 0.000 title claims abstract description 333
- 238000012546 transfer Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012360 testing method Methods 0.000 claims abstract description 78
- 230000001360 synchronised effect Effects 0.000 claims abstract description 68
- 230000005540 biological transmission Effects 0.000 claims abstract description 62
- 238000001914 filtration Methods 0.000 claims description 47
- 238000012935 Averaging Methods 0.000 claims description 16
- 238000007689 inspection Methods 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000000737 periodic effect Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 abstract description 34
- 238000003745 diagnosis Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
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- 101000860173 Myxococcus xanthus C-factor Proteins 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000011031 large-scale manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
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Abstract
The present invention is suitable for Electric Energy Metering Technology field, provides a kind of detection circuit, method and the electric energy meter of circuit transfer function variation.The circuit includes：First reference signal source, for sending benchmark test signal to objective circuit so that objective circuit exports mixed signal；Second reference signal source, for sending at least reference signal all the way to synchronizing relevant detection module；Relevant detection module is synchronized, for reference signal and mixed signal to be synchronized relevant detection, obtains detection signal, and according to the amplitude-frequency characteristic and phase frequency feature for detecting signal relative to the variation of the transmission function of the determining objective circuit of variation of preset calibrations value.The present invention can realize the variation of on-line checking objective circuit transmission function, real-time diagnosis is due to the exceeded situation of meter accuracy caused by electricity stealing or fault, the controllability of electrical energy meter electricity energy measuring accuracy is improved, reduces stealing, increases metering circuit reliability of operation and safety.
Description
Technical field
The detection circuit that changes the invention belongs to Electric Energy Metering Technology field more particularly to circuit transfer function, method and
Electric energy meter.
Background technology
In electric power system, electricity is a kind of commodity, and electric energy metering device is then a scale, whether it accurate, is directly closed
It is to the economic interests for electricity consumption both sides.Intelligent electric energy meter is in electric energy measurement at present, generally all by power network current, voltage signal
It is converted to by electric energy meter, sensor and sampling network and meets ADC (Analog to Digital Converter, analog-to-digital conversion
Chip) input voltage safe range voltage signal, the transformed digital signals of ADC are input to digital processing element again, into
Row power calculation and metering.
Electric energy meter can be Jing Guo higher precision grade before manufacture standard scale calibrated, meet electric energy meter standard regulation
Class of accuracy.After electric energy meter field installation, it can be caused due to external environment variation, component aging failure etc. are many
Electrical energy meter accuracy changes.Whether the precision of electric energy meter changes at the scene, if class of accuracy requirement is still conformed to, it is existing
The problem of whether field stealing and metering circuit failure can find, be for electricity consumption both sides' critical concern in time.
At present the administrative staff of electric energy meter after electric energy meter linked network whole life cycle management during, all using periodically from
The method that line inspects electric energy meter error by random samples, can not real time on-line monitoring find the variation of each piece of linked network electrical energy meter accuracy in time, and
Self diagnosis electricity stealing or ic for energy metering failure cause the error of electric energy tariffing, unnecessary to being brought for electricity consumption both sides
Trouble and loss.
Invention content
In view of this, an embodiment of the present invention provides the detection circuit and method of a kind of variation of circuit transfer function, with solution
Certainly in the prior art cannot detection circuit transmission function in time variation, and then be unable to the change of real time on-line monitoring electrical energy meter accuracy
Change, it is impossible to the problem of diagnosing electricity stealing and metering circuit trouble point in time.
First aspect of the embodiment of the present invention provides a kind of detection circuit of circuit transfer function variation, is coupled for detecting
The transmission function of objective circuit between the output terminal of the first signal source, first signal source are sent to the objective circuit
First signal, the detection circuit include：First reference signal source, the second reference signal source and synchronous relevant detection module；
First reference signal source, connect with the objective circuit, for sending benchmark test to the objective circuit
Signal so that the objective circuit exports the mixed signal of the benchmark test signal and first Signal averaging；
Second reference signal source is connected with the synchronous relevant detection module, for synchronizing relevant detection to described
Module sends at least reference signal all the way；
It is described to synchronize relevant detection module, it connect with the objective circuit, is also connect with second reference signal source, used
In the reference signal and the mixed signal are synchronized relevant detection, detection signal is obtained, and believe according to the detection
Number amplitude-frequency characteristic and phase frequency feature relative to preset calibrations value variation determine the objective circuit transmission function variation.
Optionally, the amplitude-frequency characteristic is signal corresponding with the amplitude of the benchmark test signal in the detection signal
Component, the phase frequency are characterized as signal component corresponding with the phase of the benchmark test signal in the detection signal.
Optionally, it is described to synchronize relevant detection module and include：Detection unit and identifying unit；
The detection unit is connect with the objective circuit, is also connect with second reference signal source, for by described in
Reference signal synchronizes relevant detection with the mixed signal, obtains detection signal；
The identifying unit is connect with the detection unit, for the amplitude-frequency characteristic and phase frequency according to the detection signal
Feature determines the variation of the transmission function of the objective circuit relative to the variation of preset calibrations value.
Optionally, the detection unit includes the first multiplier and the first low-pass filter；
The first input end of first multiplier is connect with second reference signal source, and the of first multiplier
Two input terminals are connect with the objective circuit, the input terminal of the output terminal of first multiplier and first low-pass filter
Connection；
The output terminal of first low-pass filter is connect with the identifying unit.
Optionally, the detection unit further includes the second multiplier and the second low-pass filter；
The first input end of second multiplier is connect with second reference signal source, and the of second multiplier
Two input terminals are connect with the objective circuit, the input terminal of the output terminal of second multiplier and second low-pass filter
Connection；
The output terminal of second low-pass filter is connect with the identifying unit；
Second multiplier and first multiplier are in parallel.
Optionally, second reference signal source synchronizes the orthogonal reference of relevant detection module transmission two-way to described
Signal；
It is described to synchronize relevant detection module and be additionally operable to the mixed signal reference signal orthogonal with two-way respectively
It is multiplied, low-pass filtering treatment, obtains two-way orthogonal signal, and according to obtaining the two-way orthogonal signal
Amplitude-frequency characteristic and the phase frequency feature.
Optionally, the objective circuit includes at least sampling network and measuring unit；
The sampling network is the circuit for including at least one of resistance, capacitance and inductance electronic device.
Optionally, the sampling network is arranged on integrated circuit external, the measuring unit, first reference signal
Source, second reference signal source are integrated in the synchronous relevant detection module in the integrated circuit.
Optionally, the detection circuit further includes：
The objective circuit and the wave filter group synchronized between relevant detection module are connected to, for by the mixing
Signal carries out the first filtering process, and the mixed signal after the first filtering process is output to and described synchronizes relevant detection mould
Block.
Optionally, the detection circuit further includes ic for energy metering；
The wave filter group is additionally operable to the mixed signal carrying out the second filtering process, and mixing the second filtering process
It closes signal and is output to ic for energy metering.
Second aspect of the embodiment of the present invention provides a kind of detection method of circuit transfer function variation, is coupled for detecting
The transmission function of objective circuit between the output terminal of the first signal source, first signal source are sent to the objective circuit
First signal, the circuit for applying also for including the first reference signal source, the second reference signal source and synchronous relevant detection module pass
The detection circuit of delivery function variation, including：
First reference signal source sends benchmark test signal to the objective circuit so that the objective circuit output
The mixed signal of the benchmark test signal and first Signal averaging；
Second reference signal source synchronizes relevant detection module and sends at least reference signal all the way to described；
It is described to synchronize relevant detection module the reference signal and the mixed signal are synchronized into relevant detection, it obtains
Detect signal, and described in amplitude-frequency characteristic according to the detection signal and phase frequency feature determine relative to the variation of preset calibrations value
The variation of the transmission function of objective circuit.
Optionally, the frequency of the frequency of the benchmark test signal and the reference signal is humorous with first signal
Wave frequency point, subharmonic frequency point and m-Acetyl chlorophosphonazo frequency point are unequal；
The frequency of the benchmark test signal is equal with the frequency of the reference signal.
Optionally, the waveform of signal that first reference signal source and second reference signal source are sent out is the period
Property square wave or periodic sinusoidal wave.
Optionally, the detection method further includes：
When the signal in first reference signal source or the second reference signal source present band is by outer signals
During interference, frequency hopping occurs for first reference signal source or second reference signal source.
Optionally, second reference signal source synchronizes the relevant detection module transmission reference signal all the way to described；
Described that the reference signal and the mixed signal are synchronized relevant detection, obtaining detection signal is specially：
It the reference signal will be multiplied all the way with the mixed signal, and obtain multiplying signal；
The multiplying signal is subjected to low-pass filtering, obtains the detection signal.
Optionally, second reference signal source synchronizes the orthogonal reference of relevant detection module transmission two-way to described
Signal；
The orthogonal reference signal of the two-way includes reference signal described in reference signal described in the first via and the second tunnel；
Described to synchronize relevant detection module and receive mixed signal described in two-way, mixed signal described in the two-way is respectively the
Mixed signal described in the mixed signal and the second tunnel all the way；
Described that the reference signal and the mixed signal are synchronized relevant detection, obtaining detection signal is specially：
Reference signal described in the first via with mixed signal described in the first via is multiplied, obtains the first component
Reference signal described in second tunnel is multiplied by signal with mixed signal described in second tunnel, obtains second component letter
Number；
First component signal and the second component signal are subjected to low-pass filtering respectively, obtain the orthogonal inspection of two-way
Survey signal；
The detection signal orthogonal to the two-way carries out quadratic sum and the amplitude-frequency characteristic is calculated, orthogonal to the two-way
Detection signal carry out division calculation obtain the phase frequency feature.
Optionally, the preset calibrations value includes：Preset calibrations amplitude-frequency characteristic and preset calibrations phase frequency feature；
The detection method of the circuit transfer function variation further includes：
If the amplitude-frequency characteristic is more than default amplitude-frequency changing value, the synchronization relative to the variation of preset calibrations amplitude-frequency characteristic
Relevant detection module sends out alarm signal；
If the phase frequency feature is more than default phase frequency changing value, the synchronization relative to the variation of preset calibrations phase frequency feature
Relevant detection module sends out alarm signal.
The third aspect of the embodiment of the present invention provides a kind of electric energy meter, is provided including above-described embodiment first aspect arbitrary
A kind of detection circuit of the circuit transfer function variation.
Existing advantageous effect is the embodiment of the present invention compared with prior art：First reference signal source is sent out to objective circuit
Send benchmark test signal so that objective circuit exports mixed signal；Second reference signal source is sent to relevant detection module is synchronized
At least reference signal all the way；It synchronizes relevant detection module and reference signal and mixed signal is synchronized into relevant detection, examined
Signal is surveyed, and the target electricity is determined relative to the variation of preset calibrations value according to the amplitude-frequency characteristic and phase frequency feature of detection signal
The variation of the transmission function on road realizes the variation of on-line checking objective circuit transmission function, so as to fulfill on-line monitoring electric energy
Meter accuracy changes, and real-time diagnosis improves electric energy due to electricity stealing and due to the exceeded situation of meter accuracy caused by various failures
The controllability of table electrical energy measurement precision reduces stealing, increases metering circuit reliability of operation and safety.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structure diagram of the detection circuit of circuit transfer function variation that the embodiment of the present invention one provides；
Fig. 2 is the circuit diagram of the detection circuit of circuit transfer function variation provided by Embodiment 2 of the present invention；
Fig. 3 is another circuit signal for the detection circuit of circuit transfer function variation that the embodiment of the present invention three provides
Figure；
Fig. 4 is the electricity of the detection circuit of the variation of the circuit transfer function based on three-phase current that the embodiment of the present invention five provides
Road schematic diagram；
Fig. 5 is the realization flow chart of the detection method of circuit transfer function variation that the embodiment of the present invention six provides；
Fig. 6 is a kind of specific implementation flow chart of step 503 in Fig. 5；
Fig. 7 is the trouble point signal of the detection method detection for the circuit transfer function variation that the embodiment of the present invention six provides
Figure；
Fig. 8 is another specific implementation flow chart of step 503 in Fig. 5 that the embodiment of the present invention seven provides；
Fig. 9 is the realization flow of the detection method of another circuit transfer function variation that the embodiment of the present invention eight provides
Figure.
Specific embodiment
In being described below, in order to illustrate rather than in order to limit, it is proposed that such as tool of particular system structure, technology etc
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specifically
The present invention can also be realized in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
Road and the detailed description of method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
Embodiment one
Referring to Fig. 1, a kind of detection circuit of circuit transfer function variation provided in this embodiment is coupled in for detecting
The transmission function of objective circuit between the output terminal of one signal source, first signal source send first to the objective circuit
Signal, the detection circuit include：First reference signal source 100, the second reference signal source 200 and synchronous relevant detection module
300。
First reference signal source 100 is suitable for connecting with the objective circuit, is surveyed for sending benchmark to the objective circuit
Trial signal so that the objective circuit exports the mixed signal of the benchmark test signal and first Signal averaging.
Second reference signal source 200 is connected with synchronous relevant detection module 300, for synchronizing relevant detection module 300
Send at least reference signal all the way.
It synchronizes relevant detection module 300 to connect with the objective circuit, also connect, be used for the second reference signal source 200
The reference signal and the mixed signal are synchronized into relevant detection, obtain detection signal, and according to the detection signal
Amplitude-frequency characteristic and phase frequency feature relative to preset calibrations value variation determine the objective circuit transmission function variation.
Wherein, the amplitude-frequency characteristic is signal corresponding with the amplitude of the benchmark test signal point in the detection signal
Amount, the phase frequency are characterized as signal component corresponding with the phase of the benchmark test signal in the detection signal.
Specifically, when the detection signal is signal all the way, can be determined and benchmark test signal pair by detecting signal
The amplitude and the product value of phase answered；It, then can be according to the two-way just when the detection signal is two-way orthogonal signalling
Hand over signal that amplitude corresponding with benchmark test signal and phase is calculated.
The signal frequency of first reference signal source 100 and the second reference signal source 200 is equal.
Optionally, the first reference signal source 100 and the second reference signal source 200 can be same reference signal source,
It can be different reference signal sources.
In the detection circuit of foregoing circuit transmission function variation, the first reference signal source 100 sends benchmark to objective circuit
Test signal so that objective circuit exports mixed signal；Second reference signal source 200 is sent to relevant detection module 300 is synchronized
At least reference signal all the way；It synchronizes relevant detection module 300 and reference signal and mixed signal is synchronized into relevant detection, obtain
Signal is detected, and the target is determined relative to the variation of preset calibrations value according to the amplitude-frequency characteristic and phase frequency feature of detection signal
The variation of the transmission function of circuit realizes the variation of on-line checking objective circuit transmission function, and real-time diagnosis is due to stealing row
For or fault caused by the exceeded situation of meter accuracy, improve electrical energy meter electricity energy measuring accuracy controllability, reduce stealing hair
It is raw, increase metering circuit reliability of operation and safety.
Embodiment two
According to embodiment one, referring to Fig. 2, as a kind of specific embodiment, the first reference signal source 100 and the second base
Calibration signal source 200 is different reference signal source.The signal frequency of first reference signal source 100 and the second reference signal source 200
It is equal.
Wherein, the benchmark test signal that the first reference signal source 100 is sent out can be periodic sinusoidal wave, and the second benchmark is believed
The reference signal that number source 200 is sent out can be periodic digital square-wave.
Further, the objective circuit includes：First resistor R0, second resistance R1,3rd resistor R2, the first capacitance
C1, second capacitance C2, ADC and ic for energy metering.Wherein, the ADC is used for first signal and the benchmark test
Signal averaging is the mixed signal, and the mixed signal of simulation is converted to the mixed signal of number.
The first resistor R0 is electrically connected with the first reference signal source 100, the first end of the first resistor R0 also with institute
The first end connection of second resistance R1 is stated, the second end of the first resistor R0 also connects with the first end of the 3rd resistor R2
It connects.Optionally, the first resistor R0 is copper-manganese resistance, and the value of the first resistor R0 is 200 μ Ω.
The second end of the second resistance R1 is electrically connected with the anode of the positive input terminal of ADC and the first capacitance C1.
The second end of the 3rd resistor R2 is electrically connected with the cathode of the negative input end of ADC and the second capacitance C2.
The cathode of the first capacitance C1 is connect with the anode of the second capacitance C2, and the cathode of the first capacitance C1 connects
Ground.Optionally, the resistance value of the second resistance R1 and the 3rd resistor R2 are 1K Ω, the first capacitance C1 and described
The capacitance of two capacitance C2 is 33nF.
The output terminal of the ADC is connected with the input terminal of synchronous relevant detection module 300.
Optionally, the objective circuit can include：Third capacitance C3.The reference voltage of ADC is connect by third capacitance C3
Ground.The third capacitance C3 is used to protect objective circuit.
The ic for energy metering is used to measure the electric energy of first signal source.
Further, as a kind of specific embodiment, signal source device on the basis of the first reference signal source 100.
Optionally, the reference signal source device can be current signal source or voltage signal source.The reference signal source
When device is voltage signal source, the first reference signal source 100 and first resistor R0 is connected in parallel, and is sent out to the objective circuit
Send voltage signal source；When the reference signal source device is current signal source, the first reference signal source 100 and the first resistor
R0 connects, and current signal source is sent to the objective circuit.
Wherein, the harmonic wave frequency point of the frequency of the benchmark test signal and first signal, subharmonic frequency point and humorous
Wave frequency point is unequal.
Optionally, the first reference signal source 100 and the second reference signal source 200 have frequency hopping characteristic.
When the signal in 200 present band of the first reference signal source 100 or the second reference signal source is done by outer signals
When disturbing, frequency hopping, i.e. the first reference signal source 100 or the second base occur for the first reference signal source 100 or the second reference signal source 200
The signal frequency in calibration signal source 200 changes, and is interfered to avoid by outer signals.
When the frequency phase of the frequency of the first reference signal source 100 or the second reference signal source 200 and first signal source
Whens waiting, frequency hopping also occurs for the first reference signal source 100 or the second reference signal source 200.
Further, it referring to Fig. 2, as a kind of specific embodiment, synchronizes relevant detection module 300 and includes：Detection
Unit 301 and identifying unit 302.
The first input end of detection unit 301 is connect with the objective circuit, the second input terminal of detection unit 301 with
The output terminal connection of second reference signal source 200, the output terminal of detection unit 301 are connect with the input terminal of identifying unit 302.Inspection
It surveys unit 301 to be used to the reference signal and the mixed signal synchronizing relevant detection, obtains detection signal.Detection is single
The first input end of member 301 is the first input end for synchronizing relevant detection module 300, and the second input terminal of detection unit 301 is
Synchronize the second input terminal of relevant detection module 300.
Identifying unit 302 is used for amplitude-frequency characteristic and phase frequency feature according to the detection signal relative to preset calibrations value
Variation determines the variation of the transmission function of the objective circuit.
Optionally, detection unit 301 includes：First multiplier and the first low-pass filter.Wherein, the second reference signal source
200 send reference signal all the way to relevant detection module 300 is synchronized.
The first input end of first multiplier is the first input end of detection unit 301, first multiplier
Second input terminal is the second input terminal of detection unit 301, the output terminal of first multiplier and first low-pass filtering
The input terminal connection of device, for receiving the reference signal all the way, the reference signal will be multiplied with the mixed signal all the way,
Multiplying signal is obtained, and the multiplying signal is sent to first low-pass filter.
The output terminal of first low-pass filter is connect with identifying unit 302, low for the multiplying signal to be carried out
Pass filter obtains the detection signal.
Specifically, determine the product value of amplitude corresponding with benchmark test signal and phase by detecting signal, according to
The product value of the corresponding amplitude of benchmark test signal and phase determines the variation of preset calibrations value the biography of the objective circuit
The variation of delivery function.
Optionally, it synchronizes relevant detection module 300 and further includes warning device.The warning device connects with identifying unit 302
It connects.
Identifying unit 302 is big relative to the variation of preset calibrations value in the amplitude-frequency characteristic and phase frequency feature of the detection signal
When default changing value, generation alarm signal is sent to the warning device.
Illustratively, when the product value of amplitude corresponding with benchmark test signal and phase is relative to the change of preset calibrations value
When changing more than default changing value, identifying unit 302 generates alarm signal and is sent to the warning device, and warning device passes through hair
The modes such as light, flicker or sound are alarmed, and administrative staff is prompted to check electric energy meter, check whether objective circuit breaks down,
Check whether generation electricity stealing.The present embodiment does not limit type of alarm.
Further, in one embodiment, the objective circuit includes sampling network and measuring unit, the sampling network
It is the circuit for including at least one of resistance, capacitance and inductance electronic device.
The sampling network is arranged on integrated circuit external, the measuring unit, the first reference signal source 100, the second base
Calibration signal source 200 is integrated in synchronous relevant detection module 300 in the integrated circuit.
Integrated circuit has small, and light-weight, lead-out wire and pad are few, long lifespan, and reliability is high, and it is excellent that performance is good etc.
Point, at the same it is at low cost, convenient for large-scale production.Therefore, the measuring unit, the first reference signal source 100, the second benchmark are believed
Number source 200 is integrated in synchronous relevant detection module 300 in the integrated circuit, reduces other circuit devcies to detection circuit
It influences, improves the stability of detection circuit, while save the cost of detection circuit in the present embodiment, improve the longevity of detection circuit
Life.
Further, referring to Fig. 2, the detection circuit further includes：It is connected to the objective circuit and synchronous relevant detection
Wave filter group between module 300.The wave filter group is used to the mixed signal is carried out the first filtering process, and by first
The mixed signal after filtering process, which is output to, synchronizes relevant detection module 300.
Optionally, the detection circuit further includes ic for energy metering.
The wave filter group is additionally operable to the mixed signal be carried out the second filtering process, and by the institute of the second filtering process
It states mixed signal and is output to ic for energy metering.
Ic for energy metering measures the electric energy of first signal source according to the mixed signal of the second filtering process.
In above-described embodiment, the first reference signal source 100 sends benchmark test signal to objective circuit so that objective circuit
Export mixed signal；Second reference signal source 200 sends at least reference signal all the way to relevant detection module 300 is synchronized；It is synchronous
Reference signal and mixed signal are synchronized relevant detection by relevant detection module 300, obtain detection signal, and believe according to detection
Number amplitude-frequency characteristic and phase frequency feature relative to preset calibrations value variation determine the objective circuit transmission function variation,
The variation of on-line checking objective circuit transmission function is realized, real-time diagnosis is due to ammeter caused by electricity stealing or fault
The exceeded situation of precision improves the controllability of electrical energy meter electricity energy measuring accuracy, reduces stealing, and what increase metering circuit was run can
By property and safety.
Embodiment three
Referring to Fig. 3, as a kind of specific embodiment, the first reference signal source 100 and the second reference signal source 200 are same
One reference signal source.
Wherein, the waveform for the signal that reference signal source is sent out is periodic square wave or periodic sinusoidal wave.
Reference signal source is connect with the objective circuit, is also connected with synchronous relevant detection module 300.
Reference signal source sends benchmark test signal to the objective circuit so that the objective circuit exports the benchmark
Test signal and the mixed signal of first Signal averaging；Simultaneously also relevant detection module transmission is synchronized to described at least all the way
Reference signal.
Objective circuit, wave filter group in Fig. 3 and synchronize the structure of relevant detection module 300 and advantageous effect and embodiment
Objective circuit, wave filter group in two is identical with advantageous effect with the structure of synchronous relevant detection module 300, does not do here superfluous
It states.
Example IV
According to the circuit transfer function of embodiment one, embodiment two and embodiment three change detection circuit, optionally, together
The detection unit 301 of the relevant detection module 300 of step can include：First multiplier, the second multiplier, the first low-pass filter and
Second low-pass filter.
Wherein, the second reference signal source 200 sends the orthogonal reference letter of two-way to relevant detection module 300 is synchronized
Number.The orthogonal reference signal of the two-way includes reference signal described in reference signal described in the first via and the second tunnel.
Synchronize relevant detection module 300 be additionally operable to by the mixed signal respectively the reference signal orthogonal with two-way into
Row is multiplied, low-pass filtering treatment, obtains two-way orthogonal signal, and obtain the width according to the two-way orthogonal signal
Frequency feature and the phase frequency feature.
Specifically, the second reference signal source 200 to synchronize relevant detection module 300 send reference signal described in the first via and
Reference signal described in second tunnel.Reference signal described in reference signal described in the first via and second tunnel is orthogonal.Synchronous phase
Dry detection module 300 receives mixed signal described in two-way, and mixed signal described in the two-way is respectively that letter is mixed described in the first via
Number and the second tunnel described in mixed signal；Mixed signal described in mixed signal described in the first via and the second tunnel is believed for identical mixing
Number.
The first input end of first multiplier is the first input end of detection unit 301, and the second of the first multiplier inputs
Hold the second input terminal for detection unit 301, the input of the output terminal of first multiplier and first low-pass filter
End connection, for receiving reference signal described in the first via, by reference signal described in the first via and mixed signal phase described in the first via
Multiply, obtain the first component signal, and first component signal is sent to the first low-pass filter.
The first input end of second multiplier is also the first input end of detection unit 301, the of second multiplier
Two input terminals are also the second input terminal of detection unit 301, the output terminal of second multiplier and second low-pass filtering
The input terminal connection of device for receiving reference signal described in the second tunnel, will mix described in reference signal described in the second tunnel and the second tunnel
Signal multiplication is closed, obtains second component signal, and the second component signal is sent to the second low-pass filter.
Second multiplier and first multiplier are in parallel.
The output terminal of first low-pass filter is connect with identifying unit 302, for the first component signal to be carried out low pass filtered
Wave.
The output terminal of second low-pass filter is connect with identifying unit 302, for second component signal to be carried out low pass filtered
Wave.
The first component signal by low-pass filtering and the second component signal in orthogonal Jing Guo low-pass filtering.
Amplitude corresponding with benchmark test signal and phase is calculated according to two-way orthogonal signalling, i.e., to the two-way just
The detection signal of friendship carries out quadratic sum and the amplitude-frequency characteristic is calculated, and the detection signal orthogonal to the two-way carries out division meter
Calculation obtains the phase frequency feature.
The objective circuit is determined relative to the variation of preset calibrations value according to the amplitude-frequency characteristic and the phase frequency feature
Transmission function variation, realize the variation of on-line checking objective circuit transmission function, real-time diagnosis due to electricity stealing or
The exceeded situation of meter accuracy caused by fault improves the controllability of electrical energy meter electricity energy measuring accuracy, reduces stealing, increases
Add metering circuit reliability of operation and safety.
Embodiment five
The detection circuit of another circuit transfer function variation provided in this embodiment, the first signal is coupled in for detecting
The transmission function of objective circuit between the output terminal in source, first signal source send three-phase first to the objective circuit and believe
Number, the detection circuit includes the second reference signal source 200, the first reference signal source 100 and synchronous relevant detection module 300.
First reference signal source 100 is suitable for connecting with the objective circuit, for sending three-phase base to the objective circuit
Quasi- test signal makes the mixed signal of each split-phase of the objective circuit output three-phase mixed signal.
Wherein, mixed signal of the three-phase mixed signal for the first signal of three-phase and three-phase benchmark test Signal averaging, including
The mixed signal of each split-phase.
Second reference signal source 200 is connected with synchronous relevant detection module 300, for synchronizing relevant detection module 300
Send at least three tunnel reference signals.
Relevant detection module 300 is synchronized for mixed signal of the reference signal respectively with each split-phase to be synchronized phase
Dry detection, obtains the detection signal of each split-phase, and according to the amplitude-frequency characteristic of the detection signal of each split-phase and phase frequency feature relative to
The variation of the preset calibrations value of each split-phase determines the variation of the transmission function of the objective circuit.
Further, referring to Fig. 4, in one embodiment, the first reference signal source 100 and the second reference signal source 200 are
Same reference signal source.
The objective circuit includes A circuitry phases, B circuitry phases and C circuitry phases.
Optionally, the A circuitry phases can include：Mutual inductor CT1, resistance Ra0, resistance Ra1, resistance Ra2, capacitance Ca1,
Capacitance Ca2 and A phase ADC.Mutual inductor CT1 is used to provide a discharge loop to A circuitry phases, prevents other devices of high-voltage breakdown.
The first end of mutual inductor CT1 is connect with the first end of resistance Ra0, and the of the second end of mutual inductor CT1 and resistance Ra0
Two ends connect；The first end of resistance Ra0 is also electrically connected with reference signal source, the second end ground connection of resistance Ra0.
The first end of resistance Ra1 is connect with the first end of resistance Ra0, the second end of resistance Ra1 and synchronous relevant detection mould
Block 300 is electrically connected, and the anode of the second end of resistance Ra1 also with capacitance Ca1 is connect.
The first end of resistance Ra2 is connect with the second end of resistance Ra0, the second end of resistance Ra2 and synchronous relevant detection mould
Block 300 is electrically connected, and the cathode of the second end of resistance Ra2 also with capacitance Ca2 is connect.
The cathode of capacitance Ca1 is connect with the anode of capacitance Ca2, the cathode ground connection of capacitance Ca1.
The signal positive input terminal Iap of A phases ADC is connect with the second end of resistance Ra1, the signal negative input end Ian of A phases ADC
It is connect with the second end of resistance Ra2.The A phases ADC is for obtaining the first signal of A phase benchmark test signals and A phases, by A phase bases
Quasi- test signal and the first Signal averaging of A phases mix signal for A.
Optionally, A circuitry phases can also include A phase ic for energy metering.A phases ic for energy metering and A phase filter groups
Connection, for measuring the electric energy of A circuitry phases.
Optionally, the B circuitry phases include：Mutual inductor CT2, resistance Rb0, resistance Rb1, resistance Rb2, capacitance Cb1, capacitance
Cb2 and B phases ADC.Mutual inductor CT2 is used to provide a discharge loop to B circuitry phases, prevents other devices of high-voltage breakdown.
The first end of mutual inductor CT2 is connect with the first end of resistance Rb0, and the of the second end of mutual inductor CT2 and resistance Rb0
Two ends connect；The first end of resistance Rb0 is electrically connected with reference signal source, the second end ground connection of resistance Rb0.
The first end of resistance Rb1 is connect with the first end of resistance Rb0, the second end of resistance Rb1 and synchronous relevant detection mould
Block 300 is electrically connected, and the anode of the second end of resistance Rb1 also with capacitance Cb1 is connect.
The first end of resistance Rb2 is connect with the second end of resistance Rb0, the second end of resistance Rb2 and synchronous relevant detection mould
Block 300 is electrically connected, and the cathode of the second end of resistance Rb2 also with capacitance Cb2 is connect.
The cathode of capacitance Cb1 is connect with the anode of capacitance Cb2, the cathode ground connection of capacitance Cb1.
The signal positive input terminal Ibp of B phases ADC is connect with the second end of resistance Rb1, the signal negative input end Ibn of B phases ADC
It is connect with the second end of resistance Rb2.The B phases ADC is for obtaining the first signal of B phase benchmark test signals and B phases, by B phase bases
Quasi- test signal and the first Signal averaging of B phases mix signal for B.
Optionally, B circuitry phases can also include B phase ic for energy metering.B phases ic for energy metering and B phase filter groups
Connection, for measuring the electric energy of B circuitry phases.
Optionally, the C circuitry phases include：Mutual inductor CT3, resistance Rc0, resistance Rc1, resistance Rc2, capacitance Cc1 and electricity
Hold Cc2.Mutual inductor CT3 is used to provide a discharge loop to C circuitry phases, prevents other devices of high-voltage breakdown.
The first end of mutual inductor CT3 is connect with the first end of resistance Rc0, and the of the second end of mutual inductor CT3 and resistance Rc0
Two ends connect；The first end of resistance Rc0 is electrically connected with reference signal source, the second end ground connection of resistance Rc0.
The first end of resistance Rc1 is connect with the first end of resistance Rc0, the second end of resistance Rc1 and synchronous relevant detection mould
Block 300 is electrically connected, and the anode of the second end of resistance Rc1 also with capacitance Cc1 is connect.
The first end of resistance Rc2 is connect with the second end of resistance Rc0, the second end of resistance Rc2 and synchronous relevant detection mould
Block 300 is electrically connected, and the cathode of the second end of resistance Rc2 also with capacitance Cc2 is connect.
The cathode of capacitance Cc1 is connect with the anode of capacitance Cc2, the cathode ground connection of capacitance Cc1.
The signal positive input terminal Icp of C phases ADC is connect with the second end of resistance Rc1, the signal negative input end Icn of C phases ADC
It is connect with the second end of resistance Rc2.The C phases ADC is for obtaining the first signal of C phase benchmark test signals and C phases, and by C phases
Benchmark test signal and the first Signal averaging of C phases mix signal for C.
Optionally, C circuitry phases can also include C phase ic for energy metering.C phases ic for energy metering and C phase filter groups
Connection, for measuring the electric energy of C circuitry phases.
Further, as a specific embodiment, the detection circuit further includes A phase filters group, B phase filter groups
With C phase filter groups.
The A phase filters group is connected between A phases ADC and synchronous relevant detection module 300, the B phase filters group
It is connected between B phases ADC and synchronous relevant detection module 300, the C phase filters group is connected to C phases ADC and synchronous relevant inspection
It surveys between module 300.
Wherein, A phase filters group is filtered, and be sent to and synchronize relevant inspection for mixing signal to the A
Survey module 300.B phase filters group is filtered for mixing signal to the B, and is sent to and synchronizes relevant detection mould
Block 300.C phase filters group is filtered, and be sent to and synchronize relevant detection module for mixing signal to the C
300。
Optionally, it synchronizes relevant detection module 300 and includes detection unit and identifying unit.
Detection unit is used to, according at least reference signal mixes A signal and synchronizes relevant detection all the way, obtain A phases
Detect signal；Detection unit is additionally operable to, according at least reference signal mixes B signal and synchronizes relevant detection all the way, obtain
B phases detect signal；Detection unit is additionally operable to according at least reference signal mixes C signal and synchronizes relevant detection all the way,
It obtains C phases and detects signal.
Identifying unit be used for according to A phases detect signal amplitude-frequency characteristic and phase frequency feature relative to A phase preset calibrations values
Variation determines the variation of the transmission function of A circuitry phases；According to B phases detect signal amplitude-frequency characteristic and phase frequency feature relative to B phases
The variation of preset calibrations value determines the variation of the transmission function of B circuitry phases；The amplitude-frequency characteristic of signal and phase frequency spy are detected according to C phases
Sign determines the variation of the transmission function of C circuitry phases relative to the variation of C phase preset calibrations values.
Wherein, the circuit structure of detection unit and the circuit structure phase of the detection unit in embodiment two or example IV
Together, it does not do and excessively repeats here.
Optionally, warning device can be included by synchronizing relevant detection module 300.
Illustratively, when the amplitude-frequency characteristic that A phases detect signal is more than in advance relative to the variation of A phase preset calibrations amplitude-frequency characteristics
If during amplitude-frequency changing value or A phases detect the phase frequency feature of signal be more than relative to the variation of A phase preset calibrations phase frequency features it is default
During phase frequency changing value, identifying unit 302 generates alarm signal and is sent to the warning device, and warning device is by shining, flicker
Or the modes such as sound are alarmed, and administrative staff is prompted to check electric energy meter, check whether objective circuit breaks down, and are checked whether
Electricity stealing occurs.The present embodiment does not limit type of alarm.
Optionally, reference signal source is integrated in integrated circuits with synchronous relevant detection module 300.
Optionally, A phase ADC, the B phase ADC and C phases ADC of the objective circuit can also be integrated in the integrated circuit.
It should be understood that above-described embodiment is only to be same reference signal to the first reference signal source and the second reference signal source
The explanation in source, in addition to this, the first reference signal source 100 and the second reference signal source 200 can also be different reference signals
Source, wherein, the first reference signal source 100 is identical with the signal frequency of the second reference signal source 200, here to the first reference signal
100 and second reference signal source 200 of source does not do for the circuit structure of different reference signal sources and excessively repeats.
In above-described embodiment, reference signal source sends three-phase benchmark test signal to the objective circuit, makes the target
The mixed signal of each split-phase of circuit output three-phase mixed signal also sends at least three tunnels to synchronizing relevant detection module 300
Reference signal；Synchronize relevant detection module 300 reference signal is synchronized respectively with the mixed signal of each split-phase it is relevant
Detection, obtains the detection signal of each split-phase, and according to the amplitude-frequency characteristic and phase frequency feature of the detection signal of each split-phase relative to each
The variation of the preset calibrations value of split-phase determines the variation of the transmission function of the objective circuit, realizes on-line checking objective circuit
The variation of transmission function, so as to fulfill on-line monitoring electrical energy meter accuracy variation, real-time diagnosis is due to electricity stealing and due to various
The exceeded situation of meter accuracy caused by failure improves the controllability of electrical energy meter electricity energy measuring accuracy, reduces stealing, increases meter
Measure circuit reliability of operation and safety.
Embodiment six
The detection changed corresponding to the circuit transfer function in embodiment one, embodiment two, embodiment three and example IV
Circuit present embodiments provides a kind of detection method of circuit transfer function variation, the first signal source is coupled in for detecting
The transmission function of objective circuit between output terminal, first signal source send the first signal to the objective circuit.
Referring specifically to Fig. 5, the realization flow for providing one embodiment of the detection method of circuit transfer function variation is shown
It is intended to, details are as follows：
Step S501, the first reference signal source send benchmark test signal to the objective circuit so that the target electricity
Road exports the mixed signal of the benchmark test signal and first Signal averaging.
Optionally, the harmonic wave frequency point of the frequency of the benchmark test signal and first signal, subharmonic frequency point and
Harmonic wave frequency point is unequal, i.e., the frequency of described benchmark test signal avoids the harmonic wave frequency point of the first signal source, subharmonic frequency point
With m-Acetyl chlorophosphonazo frequency point.
Optionally, the waveform of signal that first reference signal source is sent out is periodic sinusoidal wave.First benchmark
The signal that signal source is sent out has the characteristics that high stability.
Step S502, the second reference signal source synchronize relevant detection module and send at least reference signal all the way to described.
Optionally, the frequency of the reference signal and harmonic wave frequency point, subharmonic frequency point and the m-Acetyl chlorophosphonazo of first signal
Frequency point is unequal, i.e., the frequency of described reference signal avoids the harmonic wave frequency point of the first signal source, subharmonic frequency point and m-Acetyl chlorophosphonazo
Frequency point.
Optionally, the waveform of signal that second reference signal source is sent out is periodic square wave.The second benchmark letter
The signal that number source is sent out has the characteristics that high stability.
Illustratively, first signal isWherein ω0=2 π f0, f0For power supply grid
Electric voltage frequency, i.e., described power supply grid can be first signal source, V1For load current sampled signal amplitude,For power factor
Angle, it is preferred that the f0For 50Hz or 60Hz.The benchmark test signal is x2(t)=V2cos(ω1T+ θ), wherein, ω1=2 π
f1, f1On the basis of signal source frequency, θ is the phase difference between first signal and benchmark test signal, by signals transmission
Phase delay causes.The mixed signal is
Wherein, n (t) is random noise signal.
Optionally, f1Be staggered the frequency point of the harmonic wave of power supply grid, subharmonic, m-Acetyl chlorophosphonazo, i.e. f1It is humorous with first signal
Wave frequency point, subharmonic frequency point, m-Acetyl chlorophosphonazo frequency point differ, and f1>7f0。
Wherein, the frequency of the benchmark test signal is equal with the frequency of the reference signal.
Optionally, first reference signal source or second reference signal source have frequency hopping characteristic, including：
When the signal in first reference signal source or the second reference signal source present band is by outer signals
During interference, frequency hopping occurs for first reference signal source or second reference signal source.
When the frequency of first reference signal source or second reference signal source and the frequency of first signal source
When equal, frequency hopping also occurs for first reference signal source or second reference signal source.
Optionally, first reference signal source and second reference signal source can be same reference signal source,
Or different reference signal source.First reference signal source and second reference signal source are believed for different benchmark
During number source, the signal frequency of first reference signal source is equal with the signal frequency of second reference signal source.
Optionally, the detection method further includes：The mixed signal is subjected to the first filtering process, and will pass through first
The mixed signal of filtering process, which is sent to, synchronizes relevant detection module.
Illustratively, the mixed signal is filtered, filters out the frequency band and noise signal of the first signal, obtain
Mixed signal x (t)=V2cos(ω1t+θ)。
Optionally, the detection method further includes：The mixed signal is subjected to the second filtering process, is obtained by second
The mixed signal of filtering process.
The mixed signal by the second filtering process is identical with the frequency band of first signal source, described for measuring
The electric energy of first signal source.
Step S503 synchronizes relevant detection module and the reference signal and the mixed signal is synchronized relevant inspection
Survey, obtain detection signal, and according to it is described detection signal amplitude-frequency characteristic and phase frequency feature relative to preset calibrations value variation
Determine the variation of the transmission function of the objective circuit.
Wherein, the amplitude-frequency characteristic is signal corresponding with the amplitude of the benchmark test signal point in the detection signal
Amount, the phase frequency are characterized as signal component corresponding with the phase of the benchmark test signal in the detection signal.
Specifically, when the detection signal is signal all the way, can be determined and benchmark test signal pair by detecting signal
The amplitude and the product value of phase answered；It, then can be orthogonal according to the two-way when the detection signal is two-way orthogonal signalling
Amplitude corresponding with benchmark test signal and phase is calculated in signal.
Further, relevant detection module is synchronized according at least all the way reference signal r (t) to the mixed signal x
(t) relevant detection is synchronized, obtains detection signal, and amplitude-frequency characteristic and phase frequency feature are obtained according to the detection signal.Root
The biography of the objective circuit is determined relative to the variation of preset calibrations value according to the amplitude-frequency characteristic and phase frequency feature of the detection signal
The variation of delivery function.
Optionally, it is described synchronize relevant detection module be additionally operable to storage preset calibrations value.
Optionally, the reference signal source synchronizes the relevant detection module transmission reference signal all the way to described.
Further, it refers to Fig. 6, the reference signal and the mixed signal is synchronized into phase in step S503
Dry detection, the specific implementation flow for obtaining detection signal include：
Step S601 the reference signal will be multiplied all the way with the mixed signal, and obtain multiplying signal.
Illustratively, the mixed signal x (t)=V2cos(ω1T+ θ) synchronized with the reference signal r (t) it is relevant
Detection, synchronizes the reference signal described all the way that relevant detection module receives reference signal source at this time, i.e., described reference signal is r
(t)=Vr cosω1t。
Specifically, the mixed signal x (t) is multiplied with the reference signal for r (t), multiplying signal is obtained as Up
(t)=x (t) * r (t)=V2cos(ω1t+θ)*Vrcosω1t。
The multiplying signal is carried out low-pass filtering, obtains the detection signal by step S602.
Multiplying signal Up(t) low-pass filtering is proceeded through again, filters out first frequency and noise, finally obtains detection signal U0
=0.5V2VrCos θ determine the product value of amplitude corresponding with benchmark test signal and phase by detecting signal.
According to the product value of amplitude corresponding with benchmark test signal and phase relative to the variation of preset calibrations value, i.e. phase
The variation of the product value of amplitude and phase for benchmark test signal determines the variation of the transmission function of the objective circuit.
Illustratively, preset calibrations value is U'0=0.5V'2VrCos θ ', according to amplitude corresponding with benchmark test signal and
The product value 0.5V of phase2VrCos θ absolute presuppositions demarcate the product value 0.5V of amplitude and phase2'VrThe variation of cos θ, i.e. basis
The product value 0.5V of amplitude corresponding with benchmark test signal and phase2VrCos θ relative to benchmark test signal amplitude and phase
The product value 0.5V of position2'VrThe variation of cos θ determines the variation of the transmission function of objective circuit.When corresponding with benchmark test signal
Amplitude and the product value of phase when changing relative to the amplitude of benchmark test signal and the product value of phase, then illustrate mesh
The transmission function of mark circuit changes or the objective circuit failure point.
Illustratively, referring to Fig. 7, the failure of the detection method detection for circuit transfer function provided in this embodiment variation
Point schematic diagram.When a points carry out short circuit with b points in figure, stealing mesh can be reached in this way to being shunted by the electric current of resistance R0
's.But the electric current that the benchmark test signal of reference signal source transmission flows through resistance R0 is also shunted by the line of a points and b point short circuits,
The mixed signal that the first signal and benchmark test signal by shunting are formed, mixed signal, which is input to, synchronizes relevant detection module
Afterwards, relevant detection is synchronized with reference signal, obtains detection signal, according to the amplitude-frequency characteristic of detection signal relative to pre- bidding
Determining amplitude-frequency characteristic can become smaller, so as to detect the stealing event.
Illustratively, when a point rosin joints or open circuit in figure or c point rosin joints or open circuit, wave filter group monitoring it is described
The electricity at objective circuit both ends can become larger, and the mixed signal that benchmark test signal and the first signal are formed, which is input to, synchronizes relevant inspection
After surveying module, relevant detection is synchronized with reference signal, according to the amplitude-frequency characteristic of detection signal relative to preset calibrations amplitude-frequency
Feature can become larger, and so as to check, whether a points or c points exception occur in objective circuit.
Illustratively, when in figure d points occur temperature drift or failure or e points temperature drift or failure occurs, metering essence can be influenced
Degree, the mixed signal that benchmark test signal and the first signal are formed is input to synchronize relevant detection module after, with reference signal into
Row synchronizes relevant detection, can be changed relative to preset calibrations value according to the amplitude-frequency characteristic of detection signal and phase frequency feature,
So as to detect whether d points or e dot circuits exception occur.
Illustratively, when in figure f points leak electricity, can cause wave filter group monitor objective circuit electricity reduce, together
When the error of metering electric energy is made to become larger.The mixed signal that benchmark test signal and the first signal are formed, which is input to, synchronizes relevant detection
After module, relevant detection is synchronized with reference signal, according to the amplitude-frequency characteristic of detection signal and phase frequency feature relative to default
Calibration value can change, so as to detect whether f dot circuits exception occur.
Illustratively, when g points resistance, h point ADC or i point ADC reference voltages break down in figure, metering essence can be influenced
Degree, the mixed signal that benchmark test signal and the first signal are formed is input to synchronize relevant detection module after, with reference signal into
Row synchronizes relevant detection, can be changed relative to preset calibrations value according to the amplitude-frequency characteristic of detection signal and phase frequency feature,
So as to detect whether g points, h points or i points exception occur.
Further, in one embodiment, the detection method of the circuit transfer function variation further includes：
If the amplitude-frequency characteristic is more than default amplitude-frequency changing value, the synchronization relative to the variation of preset calibrations amplitude-frequency characteristic
Relevant detection module sends out alarm signal.
If the phase frequency feature is more than default phase frequency changing value, the synchronization relative to the variation of preset calibrations phase frequency feature
Relevant detection module sends out alarm signal.
Wherein, the preset calibrations value includes：Preset calibrations amplitude-frequency characteristic and preset calibrations phase frequency feature.
Optionally, it is described to synchronize relevant detection module and include warning device.
Illustratively, when detect signal amplitude-frequency characteristic be more than preset calibrations amplitude-frequency characteristic when or when detection signal phase
When frequency feature is more than preset calibrations phase frequency feature, warning device is alarmed by modes such as luminous, flicker or sound, prompts pipe
Personnel inspection electric energy meter is managed, checks whether objective circuit breaks down, checks whether generation electricity stealing.The present embodiment is to alarm
Mode does not limit.
In the detection method of foregoing circuit transmission function variation, the first reference signal source sends benchmark test to objective circuit
Signal so that objective circuit exports mixed signal；Second reference signal source is at least joined all the way to relevant detection module transmission is synchronized
Examine signal；It synchronizes relevant detection module and reference signal and mixed signal is synchronized into relevant detection, obtain detection signal, and root
The transmission letter of the objective circuit is determined relative to the variation of preset calibrations value according to the amplitude-frequency characteristic and phase frequency feature of detection signal
Several variations realizes the variation of on-line checking objective circuit transmission function, changes so as to fulfill on-line monitoring electrical energy meter accuracy,
Real-time diagnosis improves electric energy meter electrical energy measurement essence due to electricity stealing and due to the exceeded situation of meter accuracy caused by various failures
The controllability of degree reduces stealing, increases metering circuit reliability of operation and safety.
It should be understood that the size of the serial number of each step is not meant to the priority of execution sequence, each process in above-described embodiment
Execution sequence should determine that the implementation process without coping with the embodiment of the present invention forms any limit with its function and internal logic
It is fixed.
Embodiment seven
Corresponding to the detection method that the circuit transfer function of embodiment six changes, optionally, second reference signal source
The orthogonal reference signal of relevant detection module transmission two-way is synchronized to described.
The orthogonal reference signal of the two-way includes reference signal described in reference signal described in the first via and the second tunnel.
Reference signal described in reference signal described in the first via and second tunnel is orthogonal.
Described to synchronize relevant detection module and receive mixed signal described in two-way, mixed signal described in the two-way is respectively the
Mixed signal described in the mixed signal and the second tunnel all the way.Mixed signal described in mixed signal described in the first via and the second tunnel is
Identical mixed signal.
Be another specific implementation flow chart of step 503 provided in this embodiment referring to Fig. 8, in step S503 general
The reference signal synchronizes relevant detection with the mixed signal, and the specific implementation flow for obtaining detection signal includes：
Step 801, reference signal described in the first via with mixed signal described in the first via is multiplied, obtains the first component
Reference signal described in second tunnel with mixed signal described in the first via is multiplied, obtains second component signal by signal.
Illustratively, the mixed signal is x (t)=V2cos(ω1t+θ)。
Preferably, reference signal described in the first via is cosine reference signal r1(t)=cos ω1T, the second tunnel institute
Reference signal is stated as sinusoidal reference signal r2(t)=sin ω1t。
Specifically, mixed signal obtains the first component signal, i.e. U with cosine reference signal multiplicationp1=x (t) * r1(t)=
V2*cos(ω1t+θ)*cosω1t；Mixed signal is multiplied to obtain second component signal, i.e. U with sinusoidal reference signalp2=x (t) *
r2(t)=V2cos(ω1t+θ)*sinω1t。
Step 802, first component signal and the second component signal are subjected to low-pass filtering respectively, obtain two-way
Orthogonal detection signal.
To the first component signal Up1=V2cos(ω1t+θ)*cosω1The t and second component signal Up2=V2cos
(ω1t+θ)*sinω1T carries out low-pass filtering, rejection frequency f1, the noise of first component signal and described can also be filtered out
Noise in second component signal obtains the filtered first component signal U01=Amp1Cos θ are obtained filtered
The second component signal U02=Amp1sin(-θ)。
Wherein, Amp1To the filtered first component signal U01Or the filtered second component signal U02
Formula shift onto getting, i.e. U01Or U02Amplitude.
First component signal by low-pass filtering and the second component signal in orthogonal Jing Guo low-pass filtering.
Step 803, the detection signal orthogonal to the two-way carries out quadratic sum and the amplitude-frequency characteristic is calculated, to described
The orthogonal detection signal of two-way carries out division calculation and obtains the phase frequency feature.
Specifically, the detection signal includes first component signal Jing Guo low-pass filtering and passes through low-pass filtering
The second component signal, and according to first component signal Jing Guo low-pass filtering and described second Jing Guo low-pass filtering
The amplitude-frequency characteristic and the phase frequency feature is calculated in component signal.
Specifically, filtered first component signal and the filtered second component signal are put down
Side and calculating, i.e.,Carry out division calculationObtain the amplitude-frequency characteristic Amp=of detection signal | Apm1|, phase frequency feature Phase=- θ.
It is special relative to the variation of preset calibrations amplitude-frequency characteristic and phase frequency according to the amplitude-frequency characteristic Amp of the detection signal
The variation that Phase determines the transmission function of the objective circuit relative to the variation of preset calibrations phase frequency feature is levied, is found in time
Electricity stealing and fault point, improve the accuracy of electrical energy measurement, reduce stealing, ensure the safety of circuit.
Embodiment eight
Corresponding to the detection circuit that the circuit transfer function in embodiment five changes, another circuit is present embodiments provided
The detection method of transmission function variation referring specifically to Fig. 9, provides another reality of the detection method of circuit transfer function variation
The realization flow diagram of example is applied, details are as follows：
Step S901, the first reference signal source send three-phase benchmark test signal to the objective circuit, make the target
The mixed signal of each split-phase of circuit output three-phase mixed signal.
Wherein, mixed signal of the three-phase mixed signal for the first signal of three-phase and three-phase benchmark test Signal averaging, including
The mixed signal of each split-phase.
Optionally, the objective circuit includes A circuitry phases, B circuitry phases and C circuitry phases.
First reference signal source sends A phase benchmark tests signal to A circuitry phases, B phases benchmark test letter is sent to B circuitry phases
Number and to C circuitry phases send C phase benchmark test signals.
Step S902, the second reference signal source send at least three tunnel reference signals to relevant detection module is synchronized.
Specifically, the second reference signal source sends at least A phases reference signal, at least one all the way to relevant detection module is synchronized
Road B phases reference signal and at least C phases reference signal all the way.
Step S903 synchronizes relevant detection module and synchronizes mixed signal of the reference signal respectively with each split-phase
Relevant detection obtains the detection signal of each split-phase, and opposite according to the amplitude-frequency characteristic for detecting signal and phase frequency feature of each split-phase
The variation of the transmission function of the objective circuit is determined in the variation of the preset calibrations value of each split-phase.
The detection method further includes：Wave filter group obtains the three-phase mixed signal of the objective circuit, to the three-phase
The mixed signal of each split-phase in mixed signal carries out the first filtering process, by the mixing of each split-phase Jing Guo the first filtering process
Signal, which is sent to, synchronizes relevant detection module.
Optionally, the three-phase mixed signal mixes signal including A, B mixes signal and C mixes signal.Wherein,
The A mixes signal as the first signal of A phases and the signal of A phase benchmark test Signal averagings；The B mixes signal as B phases
The signal of first signal and B phase benchmark test Signal averagings；The C mixes signal as the first signal of C phases and C phase benchmark tests
The signal of Signal averaging.
Wave filter group obtains A and mixes signal, and signal is mixed to the A and carries out the first filtering process, will pass through first
The A of filtering process, which mixes signal and is sent to, synchronizes relevant detection module；It obtains B and mixes signal, signal is mixed to the B
The first filtering process is carried out, the B Jing Guo the first filtering process is mixed into signal is sent to and synchronize relevant detection module；Obtain C
Signal is mixed, signal is mixed to the C and carries out the first filtering process, the C Jing Guo the first filtering process is mixed into signal
It is sent to and synchronizes relevant detection module.
Optionally, the preset calibrations value includes A phase preset calibrations value, B phase preset calibrations values and C phase preset calibrations values.
Specifically, synchronizing relevant detection module, A phases reference signal and the A mix signal and carry out all the way by described at least
Synchronize relevant detection, obtain A phases and detect signal, and according to the A phases detect signal amplitude-frequency characteristic and phase frequency feature relative to A
The variation of phase preset calibrations value determines the variation of the transmission function of A circuitry phases.
Synchronize that relevant detection module will at least B phases reference signal and the B mix signal and synchronize relevant inspection all the way
It surveys, obtains the B phases and detect signal, and the amplitude-frequency characteristic of signal is detected according to the B phases and phase frequency feature obtains B phases and detects letter
The variation of the transmission function of B circuitry phases number is determined relative to the variation of B phase preset calibrations values.
Synchronize that relevant detection module will at least C phases reference signal mixes signal to the C and synchronizes relevant inspection all the way
It surveys, obtains the C phases and detect signal, and the amplitude-frequency characteristic for detecting according to the C phases signal is preset with phase frequency feature relative to C phases
The variation of calibration value determines the variation of the transmission function of C circuitry phases.
Optionally, the detection method of the circuit transfer function variation of the present embodiment can also detect quarter-phase circuit simultaneously
Transmission function variation.
In the detection method of foregoing circuit transmission function variation, the first reference signal source sends three-phase to the objective circuit
Benchmark test signal makes the mixed signal of each split-phase of the objective circuit output three-phase mixed signal；Second reference signal
Source sends at least three tunnel reference signals to relevant detection module is synchronized；Synchronize relevant detection module by the reference signal respectively with
The mixed signal of each split-phase synchronizes relevant detection, obtains the detection signal of each split-phase, and according to the detection signal of each split-phase
Amplitude-frequency characteristic and phase frequency feature relative to the preset calibrations value of each split-phase variation determine the objective circuit transmission function
Variation, realize the variation of on-line checking objective circuit transmission function, it is real so as to fulfill on-line monitoring electrical energy meter accuracy variation
When diagnosis due to electricity stealing and due to the exceeded situation of meter accuracy caused by various failures, improve electrical energy meter electricity energy measuring accuracy
Controllability, reduce stealing, increase metering circuit reliability of operation and safety.
Embodiment nine
An embodiment of the present invention provides a kind of electric energy meter, provide including above-described embodiment one to embodiment five any one
The detection circuit of the circuit transfer function variation, and possessed by the detection circuit with the variation of foregoing circuit transmission function
Advantageous effect.
Wherein, the electric energy meter is by the variation of on-line checking objective circuit transmission function, so as to fulfill on-line monitoring electricity
Energy meter accuracy variation, real-time diagnosis improve electricity due to electricity stealing and due to the exceeded situation of meter accuracy caused by various failures
The controllability of energy table electrical energy measurement precision, reduces stealing, increases metering circuit reliability of operation and safety.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each work(
Can unit, module division progress for example, in practical application, can be as needed and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device are divided into different functional units or module, more than completion
The all or part of function of description.Each functional unit, module in embodiment can be integrated in a processing unit, also may be used
To be that each unit is individually physically present, can also two or more units integrate in a unit, it is above-mentioned integrated
The form that hardware had both may be used in unit is realized, can also be realized in the form of SFU software functional unit.In addition, each function list
Member, the specific name of module are not limited to the protection domain of the application also only to facilitate mutually distinguish.Above system
The specific work process of middle unit, module can refer to the corresponding process in preceding method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may realize that each exemplary lists described with reference to the embodiments described herein
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is performed with hardware or software mode, specific application and design constraint depending on technical solution.Professional technician
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
The scope of the present invention.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to aforementioned reality
Example is applied the present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each
Technical solution recorded in embodiment modifies or carries out equivalent replacement to which part technical characteristic；And these are changed
Or replace, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution should all
Including within protection scope of the present invention.
Claims (18)
1. a kind of detection circuit of circuit transfer function variation, for detecting the mesh being coupled between the output terminal of the first signal source
The transmission function of circuit is marked, first signal source sends the first signal to the objective circuit, which is characterized in that the detection
Circuit includes：First reference signal source, the second reference signal source and synchronous relevant detection module；
First reference signal source, connect with the objective circuit, for sending benchmark test signal to the objective circuit,
So that the objective circuit exports the mixed signal of the benchmark test signal and first Signal averaging；
Second reference signal source is connected with the synchronous relevant detection module, for synchronizing relevant detection module to described
Send at least reference signal all the way；
It is described to synchronize relevant detection module, it connect with the objective circuit, is also connect with second reference signal source, for inciting somebody to action
The reference signal synchronizes relevant detection with the mixed signal, obtains detection signal, and according to the detection signal
Amplitude-frequency characteristic and phase frequency feature determine the variation of the transmission function of the objective circuit relative to the variation of preset calibrations value.
2. the detection circuit of circuit transfer function variation as described in claim 1, which is characterized in that the amplitude-frequency characteristic is institute
Signal component corresponding with the amplitude of the benchmark test signal in detection signal is stated, the phase frequency is characterized as the detection signal
In signal component corresponding with the phase of the benchmark test signal.
3. the detection circuit of circuit transfer function variation as described in claim 1, which is characterized in that described to synchronize relevant detection
Module includes：Detection unit and identifying unit；
The detection unit is connect with the objective circuit, is also connect with second reference signal source, for by the reference
Signal synchronizes relevant detection with the mixed signal, obtains detection signal；
The identifying unit is connect with the detection unit, for according to the detection amplitude-frequency characteristic of signal and phase frequency feature
The variation of the transmission function of the objective circuit is determined relative to the variation of preset calibrations value.
4. the detection circuit of circuit transfer function variation as claimed in claim 3, which is characterized in that the detection unit includes
First multiplier and the first low-pass filter；
The first input end of first multiplier is connect with second reference signal source, and the second of first multiplier is defeated
Enter end to connect with the objective circuit, the output terminal of first multiplier and the input terminal of first low-pass filter connect
It connects；
The output terminal of first low-pass filter is connect with the identifying unit.
5. the detection circuit of circuit transfer function variation as claimed in claim 4, which is characterized in that the detection unit is also wrapped
Include the second multiplier and the second low-pass filter；
The first input end of second multiplier is connect with second reference signal source, and the second of second multiplier is defeated
Enter end to connect with the objective circuit, the output terminal of second multiplier and the input terminal of second low-pass filter connect
It connects；
The output terminal of second low-pass filter is connect with the identifying unit；
Second multiplier and first multiplier are in parallel.
6. the detection circuit of circuit transfer function variation as described in claim 1, which is characterized in that second reference signal
Source synchronizes the orthogonal reference signal of relevant detection module transmission two-way to described；
It is described to synchronize relevant detection module and be additionally operable to that the reference signal orthogonal with two-way carries out respectively by the mixed signal
It is multiplied, low-pass filtering treatment, obtains two-way orthogonal signal, and according to being calculated the two-way orthogonal signal
Amplitude-frequency characteristic and the phase frequency feature.
7. the detection circuit of circuit transfer function variation as described in claim 1, which is characterized in that the objective circuit includes
Sampling network and measuring unit；
The sampling network is the circuit for including at least one of resistance, capacitance and inductance electronic device.
8. the detection circuit of circuit transfer function variation as claimed in claim 7, which is characterized in that the sampling network setting
In integrated circuit external, the measuring unit, first reference signal source, second reference signal source and the synchronous phase
Dry detection module is integrated in the integrated circuit.
9. such as the detection circuit of claim 1 to 8 any one of them circuit transfer function variation, which is characterized in that the inspection
Slowdown monitoring circuit further includes：
The objective circuit and the wave filter group synchronized between relevant detection module are connected to, for by the mixed signal
It carries out the first filtering process, and the mixed signal after the first filtering process is output to and described synchronizes relevant detection module.
10. the detection circuit of circuit transfer function variation as claimed in claim 9, which is characterized in that the detection circuit is also
Including ic for energy metering；
The wave filter group is additionally operable to the mixed signal carrying out the second filtering process, and the described of the second filtering process is mixed
It closes signal and is output to ic for energy metering.
11. a kind of detection method of circuit transfer function variation, is coupled in for detecting between the output terminal of the first signal source
The transmission function of objective circuit, first signal source send the first signal to the objective circuit, apply also for including first
The detection circuit that reference signal source, the second reference signal source change with the circuit transfer function of synchronous relevant detection module, it is special
Sign is, including：
First reference signal source sends benchmark test signal to the objective circuit so that described in the objective circuit output
The mixed signal of benchmark test signal and first Signal averaging；
Second reference signal source synchronizes relevant detection module and sends at least reference signal all the way to described；
It is described to synchronize relevant detection module the reference signal and the mixed signal are synchronized into relevant detection, it is detected
Signal, and the target is determined relative to the variation of preset calibrations value according to the amplitude-frequency characteristic and phase frequency feature of the detection signal
The variation of the transmission function of circuit.
12. the detection method of circuit transfer function variation as claimed in claim 11, which is characterized in that the benchmark test letter
Number frequency and the reference signal frequency with the harmonic wave frequency point, subharmonic frequency point and m-Acetyl chlorophosphonazo frequency point of first signal
It is unequal；
The frequency of the benchmark test signal is equal with the frequency of the reference signal.
13. the detection method of circuit transfer function variation as claimed in claim 11, which is characterized in that the first benchmark letter
The waveform of signal that number source and second reference signal source are sent out is periodic square wave or periodic sinusoidal wave.
14. the detection method of circuit transfer function variation as claimed in claim 11, which is characterized in that the detection method is also
Including：
When the signal in first reference signal source or the second reference signal source present band is interfered by outer signals
When, frequency hopping occurs for first reference signal source or second reference signal source.
15. the detection method of circuit transfer function variation as claimed in claim 11, which is characterized in that the second benchmark letter
Number source synchronizes relevant detection module and sends the reference signal all the way to described；
Described that the reference signal and the mixed signal are synchronized relevant detection, obtaining detection signal is specially：
It the reference signal will be multiplied all the way with the mixed signal, and obtain multiplying signal；
The multiplying signal is subjected to low-pass filtering, obtains the detection signal.
16. the detection method of circuit transfer function variation as claimed in claim 11, which is characterized in that the second benchmark letter
Number source synchronizes relevant detection module and sends the orthogonal reference signal of two-way to described；
The orthogonal reference signal of the two-way includes reference signal described in reference signal described in the first via and the second tunnel；
Described to synchronize mixed signal described in relevant detection module reception two-way, mixed signal described in the two-way is respectively the first via
Mixed signal described in the mixed signal and the second tunnel；
Described that the reference signal and the mixed signal are synchronized relevant detection, obtaining detection signal is specially：
Reference signal described in the first via with mixed signal described in the first via is multiplied, obtains the first component letter
Number, reference signal described in second tunnel with mixed signal described in second tunnel is multiplied, obtains second component signal；
First component signal and the second component signal are subjected to low-pass filtering respectively, obtain the orthogonal detection letter of two-way
Number；
The detection signal orthogonal to the two-way carries out quadratic sum and the amplitude-frequency characteristic is calculated, the inspection orthogonal to the two-way
It surveys signal progress division calculation and obtains the phase frequency feature.
17. the detection method of circuit transfer function variation as claimed in claim 11, which is characterized in that the preset calibrations value
Including：Preset calibrations amplitude-frequency characteristic and preset calibrations phase frequency feature；
The detection method of the circuit transfer function variation further includes：
If the amplitude-frequency characteristic is more than default amplitude-frequency changing value relative to the variation of preset calibrations amplitude-frequency characteristic, it is described synchronize it is relevant
Detection module sends out alarm signal；
If the phase frequency feature is more than default phase frequency changing value relative to the variation of preset calibrations phase frequency feature, it is described synchronize it is relevant
Detection module sends out alarm signal.
18. a kind of electric energy meter, which is characterized in that become including the circuit transfer function as described in any one of claims 1 to 10
The detection circuit of change.
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